#!/bin/sh

# Slackware build script for google-go-lang

# Written by Eric Schultz eric at schultzter.ca

# Copyright (c) 2012 Eric Schultz
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

PRGNAM=google-go-lang
RELEASE=${RELEASE:-linux}
VERSION=${VERSION:-1}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

# The actual install location of the Go Language (when building from source only)
GOROOT_FINAL="/opt/google/go"

# Clear the other Go environment variables so there's no conflicts (when building from source only)
unset GOROOT GOOS GOARCH GOHOSTOS GOHOSTARCH GOBIN GOARM

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i486; GARCH=386 ;;
    x86_64) ARCH=x86_64; GARCH=amd64 ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}	# For consistency's sake, use this
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}	# Drop the package in /tmp

set -e # Exit on most errors

# Setup the directories we'll use to make the package
rm -rf $PKG
mkdir -p $TMP ${PKG}/opt/google ${PKG}/etc/profile.d $OUTPUT

# Unpack the archive into the package (ex: go.go1.linux-amd64.tar.gz) directory 
cd ${PKG}/opt/google
tar -axf ${CWD}/go.go${VERSION}.${RELEASE}-${GARCH}.tar.gz

chown -R root:root .
find . \
 \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
 -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
 -exec chmod 644 {} \;

# Put the go binaries on the path and set GOROOT
cp $CWD/go.csh $PKG/etc/profile.d/go.csh.new
cp $CWD/go.sh  $PKG/etc/profile.d/go.sh.new

cd go
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  AUTHORS CONTRIBUTORS LICENSE PATENTS README VERSION \
  $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild


# Copy the slack-desc (and a custom doinst.sh if necessary) into ./install
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/doinst.sh > $PKG/install/doinst.sh

# Put the profile scripts for setting PATH and env variables
install -m0755 -oroot $CWD/go.csh $PKG/etc/profile.d/go.csh.new
install -m0755 -oroot $CWD/go.sh  $PKG/etc/profile.d/go.sh.new

# Make the package; be sure to leave it in $OUTPUT
# If package symlinks need to be created during install *before*
# your custom contents of doinst.sh runs, then add the -p switch to
# the makepkg command below -- see makepkg(8) for details
cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
